Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757379AbZFCR24 (ORCPT ); Wed, 3 Jun 2009 13:28:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755881AbZFCR2t (ORCPT ); Wed, 3 Jun 2009 13:28:49 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:35884 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753082AbZFCR2t (ORCPT ); Wed, 3 Jun 2009 13:28:49 -0400 Date: Wed, 3 Jun 2009 10:28:07 -0700 (PDT) From: Linus Torvalds X-X-Sender: torvalds@localhost.localdomain To: Eric Paris cc: Rik van Riel , "Larry H." , Christoph Lameter , Stephen Smalley , linux-mm@kvack.org, Alan Cox , linux-kernel@vger.kernel.org, pageexec@freemail.hu Subject: Re: Security fix for remapping of page 0 (was [PATCH] Change ZERO_SIZE_PTR to point at unmapped space) In-Reply-To: <7e0fb38c0906031016m77416390v37fb0673e6e50501@mail.gmail.com> Message-ID: References: <20090530192829.GK6535@oblivion.subreption.com> <20090531022158.GA9033@oblivion.subreption.com> <20090602203405.GC6701@oblivion.subreption.com> <1244041914.12272.64.camel@localhost.localdomain> <20090603162831.GF6701@oblivion.subreption.com> <4A26A689.1090300@redhat.com> <7e0fb38c0906031016m77416390v37fb0673e6e50501@mail.gmail.com> User-Agent: Alpine 2.01 (LFD 1184 2008-12-16) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 722 Lines: 21 On Wed, 3 Jun 2009, Eric Paris wrote: > > I am at least interested in hearing about the 'performance plummet.' It's perhaps not so much SElinux itself, but the AUDIT support (which it requires) that is really _very_ noticeable on microbenchmarks. Last time I ran lmbench on a Fedora kernel it was horrible. Turning off AUDIT (which also turns off SElinux) fixes it. It may be crazy distro auditing rules or whatever, but that doesn't change the basic issue. Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/